Of the cards I've tested so far, all have been dual mining ETH+DCR. I haven't tested the Red Devil's since they don't arrive until this afternoon. Now to the big question...............which would I buy again.........whichever is the cheapest. They all perform within a mh/s or two of each other. The Giga cards are of better quality and have back plates. The MSI is cheaply made, but performs slightly higher and runs hotter. Out of all of them, the MSI rig is the only one that has randomly shutdown. Both giga rigs have been a steady 29mh/s 800+dcr without a single restart for well over 24 hours. I'd buy the Giga gaming 580 8gb over the Aorus because they are slightly smaller and a bit cheaper. I honestly don't see the Red Devil's changing that opinion, but...............ya never know til testing is over.

EDIT: Bonehead move of the day.............saw a box sitting in the corner. It is full of Red Devil cards that apparently arrived early. Now I know what I'll be testing for the next few hours LMAO.

EDIT: on the Red Dragon 580 8gb...........if you are looking for a cheap card, this might be it. Bone stock straight out of the box it does 27.8mh/s ETH + 835 dcr. My only change was to add -cvddc 900 to the start bat, resulting in gpuZ saying it max's at 122watt. BUT, there is a caveat.......not much tuning does a dam thing that I have seen so far. Modding the 2:1750 to 2:2000 doesn't seem to make much difference at all other than it becomes less stable. Messing with Trixx/afterburner results in HARD crashes. This card likes it's defaults and those defaults are not too bad for a $200usd card. If you are not into tweaking and tweaking, build a rig of these. They are fire and forget.